Work-holding arbor.



E. MARKEY. v

WORK HOLDNG ARBOR. APPLICATION man DEQ-3.1911.

1 ,285,763. n Patented Nov. 26, 1918..

UNITED sTATEs `1 ATENT oEErcE.

EUGENE Manny, or ToLEDo, omo. l

WORK-HOLDING Armor..

To all 'whom z't may concern:

Be it known that I, EUGENE MARKEY, a citizen of the^United States, and a resident of Toledo, in the county of Lucas and State of Ohio, have invented a certain new and useful Work-Holding Arbor; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to .Which Ait appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part 0f this specification. 15 Th -means for use in connection with lathes or is invention relates to work-holding the like,.and particularly to a work-holding arbor for bushings or similar work-pieces.

The object of my invention is the provision of a device of the character described which is simple vand inexpensive in its constructionand capable ofbeing easily engaged with or detached from a lathe spindle and of being easily 'and quickly operated to engage a work-piece in a manner to hold it firmly on the arborin'centered relation to its axis or to release it therefrom.

' The invention is fully .described in the following specification, and while,in its broader aspect, it is capable of embodiment in numerous forms, a preferred embodiment thereof is illustrated in the accompanying drawings, in which- Figure 1 is a top plan view of an arbor embodying the invention in operative -en' gagement with a lathe shaft or spindle. Fig. 2 is an enlarged longitudinal section of the arbor, with a work-piece loosely mounted thereon. Fig. 3 is a cross-section lon the line 3-3 in Fig. 2. Fig. 4 is a perspective 'view of the work-holding sleeve of the arbor. Fig. 5 1s a section similar to Fig. 2, withlthe parts in work engaging position and embodymg a 'modified form ofthe work engag in means, and Fig. 6 is a perspective view ofgthe Work-holding sleeve employed in 1 Fig. 5. Y

Referring to the drawings, 1 designates a lathe head having the customary live spindle 2 mounted therein and having a tapered centering socket (not shown). v

The device forming my'invention in its illustrated embodiment comprises an arbor 3 having a tapered end 4 for fitting into theV tapered centering' socket in the end of thespindle 2, and having its other end reduced specieation of Letters Patent.

to a suitable size to Patented Nav. 2e, i918. Application led December 3, 1917., Serial No. 205,119. v i

to hold. The reduced ment of a work-piece 7 thereon. The outer end portion ofthe work-holding part *5 of the arbor is annularlyl reduced, as at 8, to r permit an expanding sleeve thereon; such sleeve bein of suitable diameter for its outer circumferential surface to stand .flush with the surface of the-part 5, as shownin Fig. ,2. The inner endof the Sleeve 9 is provided with a Series of longi. tudinallyextendingslits 10 to permit an ex-l pansion of such end, and .said 4end of the sleeve and the shoulder at the inner end of the reduced portionS are correspondingly tapered, as shown at 11, whereby an inward forcing ofthe sleeve with its inner end in contact with such Vshoulder will cause an ex- 9 to be mounted pansion of the split end of the sleeve and aV rm engaging'and centering of the worka piece 7 thereby relative to the arbor, as is apparent. s

The outer end of the sleeve 9 is 'closed and airod'12 is fixed at one end thereto and extends axially therefrom 'inwardly through the bushing and through the center bore or socket 13 in the outer end of the arbor. A coiled'compression spring 14 is 'disposed in .the innerend of the socket 13 and bears out wardly against the inner end of the rod 12 to normally hold it and the bushing 9 in released position, as shown in Fig. 2; The rod 12 isV provided near its inner end with a cross-pin 15 the ends of which extend in opf posite directions from the rod through registering transverse openings 16 in the arbor and a short distance beyond the arbor sides,

said openings being transversely broadened longitudinally ofthe arbor to permit limited transverse movements of the pin 15 therein lengthwise of the arbor.

A collar 17 is mounted onthe arbor adi jacent to the openings 16, being held thereon by a nut 18, and has diametrically opposed slots 19 therein into which the outer ends of the pin 15 respectively project and inwhich -bell-crank levers V2O are fulcrumed. Said levers have their short arms extending inward in engagement with the forward or outer sides ofthe pin. and have their long arms extending rearward in position to `be engaged andswung outward by the tapered end of a control collar 21 when moved for- Ward on the arbor 3 Jfor such purpose. It is evident that a rockino' of the levers Q0 by a forward movement 0I the collar 21 will effeet an inward movement of the rod' l2 against the tension of the spring 1 4 and impart an expanding or work-gripping movement to the sleeve 9. The movements of the collar 21 are controlled by a shipper lever 22, which may be fulcrumed at one side of the collar to an arm 23 extending from the lathe head 1.

If the form of work-holding sleeve 9, shown in Figs. 2 and e, is employed, it is preferable to provide the inner end portion of the arbor part 5 with aslight taper which is suiiicient for the inner end of the work 7 to have a wedging or centering action thereon thus adapting such taper to copera'te with the expanding action oit the sleeve 9 to center and hold the Work on the arbor.

In the modiiied form of the invention illustrated in Fig. 5, the expanding Workliolding sleeve, which is designated 24:, is open at both ends and has both ends provided witli a series of vlongitudinal slits to near the center thereof to adapt the bushing to be expanded at both ends and to have holding and centering engagement .With the work at longitudinally spaced .points thereon. The outer end of the rod 12 instead of being ixed to the outer end ofthe expanding sleeve, carries an expanding disk 25, which is tapered at its inner side to adapt it to coa-ct with the tapered outer end wall of the bushin to effect an expansion thereof and also to iorce the bushing inward to cause its inner end to travel u the abuttin tapered shoulder of the ar r so that hoti ends of the bushing4 are uniformly expanded against the work-piece. In this case it is not necessary to taper the inner end of the portion of the arbor over which the Work is laced.

t is evident that I have provided a simple and efficient means for use in connection with lathe spindles for clamping bushings or similar work-pieces in centered relation thereto, and that such means is capable of being easily and quickly operated to release or engage a Workiece. It is also evident that the work-holdping arbor may be easily and quickly engaged with or removed from a lathe spindle.

I wish it understood that my invention is not limited to any specic construction, ar-

-` rangement or form of the parts except in so far as such limitations are specied in the claims.

Having thus described my invention, What I claim asnew and desire to secure by Letters Patent, is,'-

l. In a device of the class described, an arbor having an end thereof adapted to enter a cylindrical Work-piece and having a: portion reduced and provided with a tapered weaves inner end wall, an expanding bushing mounted on said reduced end portion of the arbor, and means opeiable through the arbor to move the bushing lengthwise of the arbor to cause an'expansion of its inner end by coaction with said taper.

2. ,In a device of theclass described, an arbor havingan end adapted for insertion into a cylindrical work-piece and having a portion of such end reduced, said arbor also having an axial socket in its Work-holding end portion and transverse openings leading therefrom, an expanding bushing mounted on, said reduced end portion of the arbor and operable to have an expandinoi work-holding action when moved in-one direction longitudinallyof the arbor, meanshaving a' part extending into said socket and having parts extending outward through said openings and operable to move said bushing lengthwise of the arbor to edect an expansion of the bushing, and manually controlled means operable to act on said first means to impart predetermined movements thereto.

3. In a device of the class described, any

arbor having one end tapered for tting into a lathe spindle centering socket, and having its otherend adapted to enter and carry a cylindrical Work-piece and provided with a reduced portion, an expanding bushing mounted on said reduced portion and cooperating with said arbor to have an expanding work-holding action when moved toward the taperedJ end of the arbor, said arbor having an axial socket in its reduced end, a rod mounted for ieciprocatory movements in said socket and having a part in engagement with said bushing and having transversely projecting arms extending beyond the sides of said arbor, bell-crank 1evers carried by said arbor in position to engage said arms to move said rod lengthwisey of the arbor and impart an expanding movement lto said bushing, and means having a. part mounted on the arbor and shitable to engage and impart rocking movements to said levers, and a spring normally urging an outward movement of said rod.

4. In a device of the class described, a Work holding arbor having a' tapered shoulder spaced from the end of its Work holding portion, a double-expanding-end bushing mounted on said arbor with one end in engagement With'said'shoulder and with its other end projecting without the work holding end of the arbor, and means carried by the arbor and operable-to expand the outer end of said bushing and to impart longitudinal movement to the bushing in coac- 5. In a device of the class described, an

arbor having a portion adapted to enter a lwork-piece and provided with a conical shoulder in spaced relation to its work en- I tering end, a bushing removably mounted on the work entering end of the arbor and having both ends longitudinally split to permit expansion thereof and its inner end in 5 conc-tion with said shoulder, and means oarried by the arbor and operabley to'coact with the outer end of said bushing to effect an expansion thereof and to move the bushing longitudinally to eozlct with Suid shoulder to effect un expansion of the inner end of the 10 bushing.

In testimony whereof, I have hereunto signed my name to this speeieation.

EUGENE MARKEY. 

